3D display devices

ABSTRACT

In an embodiment of the invention, a 3D display device is provided. The 3D display device includes: a first substrate including a plurality of right eye pixels and left eye pixels in an alternate arrangement; a second substrate opposite to the first substrate; a first optical modulating unit with a first inclined direction located in the right eye pixels between the first substrate and the second substrate; a second optical modulating unit with a second inclined direction located in the left eye pixels between the first substrate and the second substrate, wherein the first inclined direction is distinct from the second inclined direction; and a light transparent element disposed on the second substrate.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a 3D display device, and in particular to a 3Ddisplay device capable of improving brightness.

2. Description of the Related Art

Liquid crystal display devices are used for many kinds of electronicdevices such as a mobile telephone, a television receiver, or the like,and much research has been done for further improving the quality.

While the advantages of a liquid crystal display device are its smallsize, light weight, and low power consumption compared to a CRT(cathode-ray tube). For the liquid crystal display device, one problemis narrow viewing angle, especially in vertical alignment mode. In-planeswitching mode liquid crystal alignment has better viewing angleperformance. In recent years, much research has been done on multidomain methods. That is, an alignment division method to improve viewingangle characteristics. For example, an MVA (multi-domain verticalalignment) or PVA (patterned vertical alignment) mode pixel has multipleVA (vertical alignment) liquid crystal area in symmetric arrangement.

The multi-domain, however, causes devices to have a small aperture ratiodue to the boundary area between domains. Generally, the domain boundaryis located at the center of pixels. The domain boundary is dark, whichcauses low light transmittance.

Thus, improving the brightness of LCDs is desirable, especially for 3Dapplication.

BRIEF SUMMARY OF THE INVENTION

One embodiment of the invention provides a 3D display device,comprising: a first substrate comprising a plurality of right eye pixelsand left eye pixels in an alternate arrangement; a second substrateopposite to the first substrate; a first optical modulating unit with afirst inclined direction located in the right eye pixels between thefirst substrate and the second substrate; a second optical modulatingunit with a second inclined direction located in the left eye pixelsbetween the first substrate and the second substrate, wherein the firstinclined direction is distinct from the second inclined direction; and alight transparent element disposed between the second substrate and anobserver. The light transparent element comprises a lens or a barrierwith an aperture.

In an embodiment, the first optical modulating unit and the secondoptical modulating unit are liquid crystal molecules having a long axis.In a vertical alignment (VA) mode, the 3D display device furthercomprises a common electrode comprising a plurality of holes formed onthe second substrate, wherein the hole is located at a boundary betweenthe right eye pixel and the left eye pixel. The arrangement of theliquid crystal molecules with the first inclined direction located inthe right eye pixel is a mirror image of the arrangement of the liquidcrystal molecules with the second inclined direction located in the lefteye pixel which is adjacent to the right eye pixel. The liquid crystalmolecules are divided into a plurality of domains surrounding the onehole in the right eye pixel and the left eye pixel which is adjacent tothe right eye pixel. The domain in the right eye pixel is a mirror imageof the domain in the left eye pixel which is adjacent to the right eyepixel. All of the light through the right eye pixel is approximatelyperpendicular to the long axis of the liquid crystal molecules which isreceived by right eye of the observer after passing through the lighttransparent element. All of the light through the left eye pixel isapproximately perpendicular to the long axis of the liquid crystalmolecules which is received by left eye of the observer after passingthrough the light transparent element. In another vertical alignment(VA) mode, the 3D display device further comprises a plurality ofprotrusions formed on a common electrode on the second substrate,wherein the protrusion is located at a boundary between the right eyepixel and the left eye pixel. The arrangement of the liquid crystalmolecules with the first inclined direction located in the right eyepixel is a mirror image of the arrangement of the liquid crystalmolecules with the second inclined direction located in the left eyepixel which is adjacent to the right eye pixel. The liquid crystalmolecules are divided into a plurality of domains surrounding the oneprotrusion in the right eye pixel and the left eye pixel which isadjacent to the right eye pixel. The number of the domains in the righteye pixel is equal to the number of the domains in the left eye pixelwhich is adjacent to the right eye pixel. All of the light through theright eye pixel is approximately perpendicular to the long axis of theliquid crystal molecules which is received by right eye of the observerafter passing through the light transparent element. All of the lightthrough the left eye pixel is approximately perpendicular to the longaxis of the liquid crystal molecules which is received by left eye ofthe observer after passing through the light transparent element.

In an in-plane switching (IPS) mode, the 3D display device furthercomprises a first pixel electrode formed in the right eye pixel of thefirst substrate, wherein the first pixel electrode comprises a pluralityof first slits with a first direction. The 3D display device furthercomprises a second pixel electrode formed in the left eye pixel of thefirst substrate, wherein the second pixel electrode comprises aplurality of second slits with a second direction, and the firstdirection is distinct from the second direction.

In an embodiment, the first optical modulating unit and the secondoptical modulating unit are organic light emitting diodes (OLEDs). TheOLED comprises a first electrode, a light emitting layer having asurface formed on the first electrode and a second electrode formed onthe light emitting layer. The OLED emits white light. Lightperpendicular to the surface of the light emitting layer of the OLEDemitted from the right eye pixel is received by right eye of theobserver after passing through the light transparent element. Lightperpendicular to the surface of the light emitting layer of the OLEDemitted from the left eye pixel is received by left eye of the observerafter passing through the light transparent element.

In an embodiment, the first optical modulating unit and the secondoptical modulating unit are reflective particles encapsulated bymicrocapsules. The reflective particles reflect outside light to form areflected light. The reflected light emitted from the right eye pixel isreceived by right eye of the observer after passing through the lighttransparent element. The reflected light emitted from the left eye pixelis received by left eye of the observer after passing through the lighttransparent element.

A detailed description is given in the following embodiments withreference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the subsequentdetailed description and examples with references made to theaccompanying drawing, wherein:

FIG. 1A shows a cross-section view of a 3D display device according toan embodiment of the invention;

FIG. 1B shows a top view of a common electrode of a 3D display deviceaccording to an embodiment of the invention;

FIG. 2A shows a cross-section view of a 3D display device according toan embodiment of the invention;

FIG. 2B shows a top view of a common electrode of a 3D display deviceaccording to an embodiment of the invention;

FIG. 3A shows a cross-section view of a 3D display device according toan embodiment of the invention;

FIG. 3B shows a top view of a pixel electrode of a 3D display deviceaccording to an embodiment of the invention;

FIG. 4 shows a cross-section view of a 3D display device according to anembodiment of the invention; and

FIG. 5 shows a cross-section view of a 3D display device according to anembodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

According to one embodiment of the invention, referring to FIG. 1A, a 3Ddisplay device is provided. A 3D display device 10 comprises a firstsubstrate 12 comprising a plurality of right eye pixels R and left eyepixels L in an alternate arrangement, a second substrate 14 opposite tothe first substrate 12, a first optical modulating unit 16 with a firstinclined direction 18 located in the right eye pixels R between thefirst substrate 12 and the second substrate 14, a second opticalmodulating unit 16′ with a second inclined direction 18′ located in theleft eye pixels L between the first substrate 12 and the secondsubstrate 14, and a light transparent element 19 disposed between thesecond substrate 14 and an observer. The first inclined direction 18 isdistinct from the second inclined direction 18′.

The first substrate 12 may be a thin film transistor (TFT) arraysubstrate. The second substrate 14 may be a color filter (CF) arraysubstrate. In this embodiment, the light transparent element 19 is afixed type barrier, for example a barrier 21 with a plurality ofapertures 23. In other embodiment, switchable barrier cells that can beturned ON/OFF by a voltage apply for LC cells are still available. Inother embodiment, for example, a fixed type lenticular lens orswitchable lens cells that can be turned ON/OFF by a voltage apply forLC cells are still available.

In this embodiment, the first optical modulating unit 16 and the secondoptical modulating unit 16′ are liquid crystal molecules (16, 16′)having a long axis 20. In a vertical alignment (VA) mode, the 3D displaydevice 10 further comprises a common electrode 22, for example ITO,comprising a plurality of holes 24 (e.g., ITO holes) formed on thesecond substrate 14. Specifically, the hole 24 is located at a boundary26 between the right eye pixel R and the left eye pixel L.

In FIG. 1A, the liquid crystal molecules 16 incline to, for example, theleft such that the arrangement of the liquid crystal molecules 16 withthe first inclined direction 18 located in the right eye pixel R is amirror image of the arrangement of the liquid crystal molecules 16′ withthe second inclined direction 18′ located in the left eye pixel L whichis adjacent to the right eye pixel R.

Referring to FIG. 1B, a top view of the common electrode 22 of the 3Ddisplay device 10, the liquid crystal molecules (16, 16′) are dividedinto a plurality of domains (28, 28′) (multi-domain) surrounding the onehole 24 in the right eye pixel R and the left eye pixel L which isadjacent to the right eye pixel R. Specifically, the number of thedomains 28 in the right eye pixel R is equal to the number of thedomains 28′ in the left eye pixel L which is adjacent to the right eyepixel R. Additionally, the domain 28 in the right eye pixel R is amirror image of the domain 28′ in the left eye pixel L which is adjacentto the right eye pixel R.

Still referring to FIG. 1A, specifically, all of the light 30 throughthe right eye pixel R is approximately perpendicular to the long axis 20of the liquid crystal molecules 16 which is received by right eye 25 ofthe observer after passing through the aperture 23 of the barrier 21.Similarly, all of the light 30′ through the left eye pixel L isapproximately perpendicular to the long axis 20 of the liquid crystalmolecules 16′ which is received by left eye 27 of the observer afterpassing through the aperture 23 of the barrier 21. Compared to theconventional vertical alignment (VA) mode in which the ITO hole isopened within the right eye pixel or the left eye pixel such that theliquid crystal molecules are inclined along at least two directions(forming at least one domain boundary) in the right eye pixel or theleft eye pixel causing merely a part of the light to travel through theright eye pixel or the left eye pixel approximately perpendicular to thelong axis of the liquid crystal molecules to be received by right eye orleft eye of an observer (see average brightness), the invention in whichthe ITO hole is opened at the boundary between the right eye pixel andthe left eye pixel such that the liquid crystal molecules are inclinedalong only one direction (nearly no domain boundary effect) in the righteye pixel or the left eye pixel causing all of the light to travelthrough the right eye pixel or the left eye pixel approximatelyperpendicular to the long axis of the liquid crystal molecules to bereceived by right eye or left eye of an observer (see peak brightness)after passing through the light transparent element, significantlyimproves brightness.

According to one embodiment of the invention, referring to FIG. 2A, a 3Ddisplay device is provided. A 3D display device 100 comprises a firstsubstrate 120 comprising a plurality of right eye pixels R and left eyepixels L in an alternate arrangement, a second substrate 140 opposite tothe first substrate 120, a first optical modulating unit 160 with afirst inclined direction 180 located in the right eye pixels R betweenthe first substrate 120 and the second substrate 140, a second opticalmodulating unit 160′ with a second inclined direction 180′ located inthe left eye pixels L between the first substrate 120 and the secondsubstrate 140, and a light transparent element 190 disposed between thesecond substrate 140 and an observer. The first inclined direction 180is distinct from the second inclined direction 180′.

The first substrate 120 may be a thin film transistor (TFT) arraysubstrate. The second substrate 140 may be a color filter (CF) arraysubstrate. In this embodiment, the light direct element 190 is a fixedtype barrier, for example a barrier 210 with a plurality of apertures230. In other embodiment, switchable barrier cells that can be turnedON/OFF by a voltage apply for LC cells are still available. In otherembodiment, for example, a fixed type lenticular lens or switchable lenscells that can be turned ON/OFF by a voltage apply for LC cells arestill available.

In this embodiment, the first optical modulating unit 160 and the secondoptical modulating unit 160′ are liquid crystal molecules (160, 160′)having a long axis 200. In a vertical alignment (VA) mode, the 3Ddisplay device 100 further comprises a plurality of protrusions 210formed on a common electrode 220, for example ITO, on the secondsubstrate 140. Specifically, the protrusion 210 is located at a boundary260 between the right eye pixel R and the left eye pixel L.

In FIG. 2A, the liquid crystal molecules 160 incline to, for example,the left such that the arrangement of the liquid crystal molecules 160with the first inclined direction 180 located in the right eye pixel Ris a mirror image of the arrangement of the liquid crystal molecules160′ with the second inclined direction 180′ located in the left eyepixel L which is adjacent to the right eye pixel R.

Referring to FIG. 2B, a top view of the common electrode 220 of the 3Ddisplay device 100, the liquid crystal molecules (160, 160′) are dividedinto a plurality of domains (280, 280′) (multi-domain) surrounding theone protrusion 210 in the right eye pixel R and the left eye pixel Lwhich is adjacent to the right eye pixel R. Specifically, the number ofthe domains 280 in the right eye pixel R is equal to the number of thedomains 280′ in the left eye pixel L which is adjacent to the right eyepixel R. Additionally, the domain 280 in the right eye pixel R is amirror image of the domain 280′ in the left eye pixel L which isadjacent to the right eye pixel R.

Still referring to FIG. 2A, specifically, all of the light 300 throughthe right eye pixel R is approximately perpendicular to the long axis200 of the liquid crystal molecules 160 which is received by right eye250 of the observer after passing through the aperture 230 of thebarrier 210. Similarly, all of the light 300′ through the left eye pixelL is approximately perpendicular to the long axis 200 of the liquidcrystal molecules 160′ which is received by left eye 270 of the observerafter passing through the aperture 230 of the barrier 210. Compared tothe conventional vertical alignment (VA) mode in which the protrusion isdisposed within the right eye pixel or the left eye pixel such that theliquid crystal molecules are inclined along at least two directions(forming at least one domain boundary) in the right eye pixel or theleft eye pixel causing merely a part of the light to travel through theright eye pixel or the left eye pixel approximately perpendicular to thelong axis of the liquid crystal molecules to be received by right eye orleft eye of an observer (see average brightness), the invention in whichthe protrusion is disposed at the boundary between the right eye pixeland the left eye pixel such that the liquid crystal molecules areinclined along only one direction (no domain boundary) in the right eyepixel or the left eye pixel causing all of the light to travel throughthe right eye pixel or the left eye pixel approximately perpendicular tothe long axis of the liquid crystal molecules to be received by righteye or left eye of an observer (see peak brightness) after passingthrough the light transparent element, significantly improvesbrightness.

According to one embodiment of the invention, referring to FIG. 3A, a 3Ddisplay device is provided. A 3D display device 50 comprises a firstsubstrate 52 comprising a plurality of right eye pixels R and left eyepixels L in an alternate arrangement, a second substrate 54 opposite tothe first substrate 52, a first optical modulating unit 56 with a firstinclined direction 58 located in the right eye pixels R between thefirst substrate 52 and the second substrate 54, a second opticalmodulating unit 56′ with a second inclined direction 58′ located in theleft eye pixels L between the first substrate 52 and the secondsubstrate 54, and a light transparent element (not shown) disposedbetween the second substrate 54 and an observer. The first inclineddirection 58 is distinct from the second inclined direction 58′.

The first substrate 52 may be a thin film transistor (TFT) arraysubstrate. The second substrate 54 may be a color filter (CF) arraysubstrate. In this embodiment, the light transparent element (not shown)is a fixed type barrier, for example a barrier with a plurality ofapertures. In other embodiment, switchable barrier cells that can beturned ON/OFF by a voltage apply for LC cells are still available. Inother embodiment, for example, a fixed type lenticular lens orswitchable lens cells that can be turned ON/OFF by a voltage apply forLC cells are still available.

In this embodiment, the first optical modulating unit 56 and the secondoptical modulating unit 56′ are liquid crystal molecules (56, 56′). Inan in-plane switching (IPS) mode, simultaneously referring to FIGS. 3Aand 3B, wherein FIG. 3B is a top view of pixel electrodes of the 3Ddisplay device 50, the 3D display device 50 further comprises a firstpixel electrode 60 formed in the right eye pixel R of the firstsubstrate 52. The first pixel electrode 60 comprises a plurality offirst slits 62 with a first direction 64. Additionally, the 3D displaydevice 50 further comprises a second pixel electrode 60′ formed in theleft eye pixel L of the first substrate 52. The second pixel electrode60′ comprises a plurality of second slits 62′ with a second direction64′. The first direction 64 is distinct from the second direction 64′.

In FIGS. 3A and 3B, the liquid crystal molecules 56 with the firstinclined direction 58 switched by the first slits 62 with the firstdirection 64 located in the right eye pixels R and the liquid crystalmolecules 56′ with the second inclined direction 58′ switched by thesecond slits 62′ with the second direction 64′ located in the left eyepixels L are collectively formed into a multi-domain structure.

In this embodiment, the structure of the IPS mode is good fortransmittance due to no domain boundary in one pixel. The IPS modedoesn't have advantage regarding light direction control like the VAmode.

According to one embodiment of the invention, referring to FIG. 4, a 3Ddisplay device is provided. A 3D display device 150 comprises a firstsubstrate 152 comprising a plurality of right eye pixels R and left eyepixels L in an alternate arrangement, a second substrate 154 opposite tothe first substrate 152, a first optical modulating unit 156 with afirst inclined direction 158 located in the right eye pixels R betweenthe first substrate 152 and the second substrate 154, a second opticalmodulating unit 156′ with a second inclined direction 158′ located inthe left eye pixels L between the first substrate 152 and the secondsubstrate 154, and a light transparent element 159 disposed between thesecond substrate 154 and an observer. The first inclined direction 158is distinct from the second inclined direction 158′.

The first substrate 152 may be a thin film transistor (TFT) arraysubstrate. In this embodiment, an organic film 160 having a firstinclined surface 161 and a second inclined surface 161′ is formed on thefirst substrate 152 such that the first optical modulating unit 156 andthe second optical modulating unit 156′ subsequently disposed on theorganic film 160 are correspondingly inclined toward specificdirections. A color filter 162 comprising, for example a red colorfilter, a green color filter and a blue color filter, is formed on thesecond substrate 154. In this embodiment, the light transparent element159 is a fixed type barrier, for example a barrier 163 with a pluralityof apertures 165. In other embodiment, switchable barrier cells that canbe turned ON/OFF by a voltage apply for LC cells are still available. Inother embodiment, for example, a fixed type lenticular lens orswitchable lens cells that can be turned ON/OFF by a voltage apply forLC cells are still available.

In this embodiment, the first optical modulating unit 156 and the secondoptical modulating unit 156′ are organic light emitting diodes (OLEDs)(156, 156′) (e.g., OLED mode), for example top-emitting OLEDs. The OLED(156, 156′) comprises a first electrode 164, a light emitting layer 166having a surface (167, 167′) formed on the first electrode 164 and asecond electrode 168 formed on the light emitting layer 166. Inaccordance with various product requirements, the OLED (156, 156′) emitslight with various colors. In this embodiment, the OLED (156, 156′)emits white light. Specifically, light 170 perpendicular to the surface167 of the light emitting layer 166 of the OLED 156 emitted from theright eye pixel R is received by right eye 169 of an observer afterpassing through the aperture 165 of the barrier 163. Similarly, light170′ perpendicular to the surface 167′ of the light emitting layer 166of the OLED 156′ emitted from the left eye pixel L is received by lefteye 171 of an observer after passing through the aperture 165 of thebarrier 163. Compared to the conventional planar OLEDs, the invention inwhich the inclined OLEDs are respectively disposed in the right eyepixel and the left eye pixel such that the light perpendicular to thesurface of the light emitting layer of the OLEDs (e.g., the brightestlight) emitted from the right eye pixel and the left eye pixel isrespectively received by right eye and left eye of an observer (see peakbrightness) after passing through the light transparent element,significantly improves brightness.

According to one embodiment of the invention, referring to FIG. 5, a 3Ddisplay device is provided. A 3D display device 200 comprises a firstsubstrate 202 comprising a plurality of right eye pixels R and left eyepixels L in an alternate arrangement, a second substrate 204 opposite tothe first substrate 202, a first optical modulating unit 206 with afirst inclined direction 208 located in the right eye pixels R betweenthe first substrate 202 and the second substrate 204, a second opticalmodulating unit 206′ with a second inclined direction 208′ located inthe left eye pixels L between the first substrate 202 and the secondsubstrate 204, and a light transparent element 209 disposed between thesecond substrate 204 and an observer. The first inclined direction 208is distinct from the second inclined direction 208′.

The first substrate 202 may be a thin film transistor (TFT) arraysubstrate. In this embodiment, an organic film 210 having a firstinclined surface 211 and a second inclined surface 211′ is formed on thefirst substrate 202 such that reflective electrodes 214 subsequentlydisposed on the organic film 210 are correspondingly inclined towardspecific directions. A color filter 212 comprising, for example a redcolor filter, a green color filter and a blue color filter, is formed onthe second substrate 204. In this embodiment, the light transparentelement 209 is a fixed type barrier, for example a barrier 213 with aplurality of apertures 215. In other embodiment, switchable barriercells that can be turned ON/OFF by a voltage apply for LC cells arestill available. In other embodiment, for example, a fixed typelenticular lens or switchable lens cells that can be turned ON/OFF by avoltage apply for LC cells are still available.

In this embodiment, the first optical modulating unit 206 and the secondoptical modulating unit 206′ are reflective particles (206, 206′)encapsulated by microcapsules 216 (e.g., e-paper mode). The reflectiveparticles (206, 206′) reflect outside light 218 to form a reflectedlight (220, 220′). The location of the reflective particles (206, 206′)is controlled by the underneath reflective electrodes 214 so that thereflective particles (206, 206′) are inclined toward specific directionsdue to the inclined reflective electrodes 214. Specifically, thereflected light 220 reflected by the reflective particles 206 emittedfrom the right eye pixel R is received by right eye 217 of the observerafter passing through the aperture 215 of the barrier 213. Similarly,the reflected light 220′ reflected by the reflective particles 206′emitted from the right eye pixel L is received by right eye 219 of theobserver after passing through the aperture 215 of the barrier 213.Compared to the conventional planar reflective electrodes, the inventionin which the inclined reflective electrodes are respectively disposed inthe right eye pixel and the left eye pixel such that the abovereflective particles are led toward specific directions in the right eyepixel and the left eye pixel causing the reflected light reflected bythe reflective particles (e.g., the brightest light) emitted from theright eye pixel and the left eye pixel respectively to be received byright eye and left eye of an observer (see peak brightness) afterpassing through the light transparent element, significantly improvesbrightness.

The comparison of the ability of light direction control and the designof no-domain boundary between the various modes, for example VA, IPS,OLED and e-paper modes, of the optical modulating units of the inventionis shown in Table 1.

TABLE 1 Mode Light direction control No-domain boundary VA Good Yes IPSNo Yes OLED Good No e-paper Good No

While the invention has been described by way of example and in terms ofpreferred embodiment, it is to be understood that the invention is notlimited thereto. To the contrary, it is intended to cover variousmodifications and similar arrangements (as would be apparent to thoseskilled in the art). Therefore, the scope of the appended claims shouldbe accorded the broadest interpretation so as to encompass all suchmodifications and similar arrangements.

What is claimed is:
 1. A 3D display device, comprising: a firstsubstrate comprising a plurality of right eye pixels and left eye pixelsin an alternate arrangement; a second substrate; a first opticalmodulating unit with a first inclined direction located in the right eyepixels between the first substrate and the second substrate; a secondoptical modulating unit with a second inclined direction located in theleft eye pixels between the first substrate and the second substrate; acommon electrode comprising a plurality of holes formed on the secondsubstrate; and a light transparent element, wherein the hole is locatedat a boundary between the right eye pixel and the left eye pixel,wherein the first inclined direction is distinct from the secondinclined direction.
 2. The 3D display device as claimed in claim 1,wherein the first optical modulating unit and the second opticalmodulating unit are liquid crystal molecules having a long axis.
 3. The3D display device as claimed in claim 1, wherein the arrangement of theliquid crystal molecules with the first inclined direction located inthe right eye pixel is a mirror image of the arrangement of the liquidcrystal molecules with the second inclined direction located in the lefteye pixel which is adjacent to the right eye pixel.
 4. The 3D displaydevice as claimed in claim 1, wherein the liquid crystal molecules aredivided into a plurality of domains surrounding the one hole in theright eye pixel and the left eye pixel which is adjacent to the righteye pixel.
 5. The 3D display device as claimed in claim 4, wherein thenumber of the domains in the right eye pixel is equal to the number ofthe domains in the left eye pixel which is adjacent to the right eyepixel.
 6. The 3D display device as claimed in claim 1, wherein all ofthe light through the right eye pixel is approximately perpendicular tothe long axis of the liquid crystal molecules which is received by righteye of an observer after passing through the light transparent element.7. The 3D display device as claimed in claim 1, wherein all of the lightthrough the left eye pixel is approximately perpendicular to the longaxis of the liquid crystal molecules which is received by left eye of anobserver after passing through the light transparent element.
 8. The 3Ddisplay device as claimed in claim 1, wherein the light transparentelement comprises a lens or a barrier.
 9. A display device, comprising:a first substrate comprising a plurality of right eye pixels and lefteye pixels in an alternate arrangement; a second substrate; a firstoptical modulating unit with a first inclined direction between thefirst substrate and the second substrate; a second optical modulatingunit with a second inclined direction between the first substrate andthe second substrate; a common electrode comprising a plurality of holesformed on the second substrate; and a light transparent element, whereinthe hole is located at a boundary between the right eye pixel and theleft eye pixel, wherein the first inclined direction is distinct fromthe second inclined direction.